Title:
FREQUENCY SWEEP CHARACTERISTIC MEASUREMENT DEVICE, LIDAR DEVICE, AND FREQUENCY SWEEP CHARACTERISTIC MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2023/228805
Kind Code:
A1
Abstract:
In a frequency sweep characteristic measurement device 2, an asymmetric MZI 120 splits laser light to generate a predetermined optical path length difference, and then combines the split light to generate a composite light, and a light receiver 121 receives the composite light, converts the composite light into a beat signal, and outputs the beat signal. A second signal processing unit 123 calculates a frequency sweep characteristic of laser light outputted by an LD 100 by performing predetermined signal processing on the beat signal to calculate a nonlinear component. At the same time, the second signal processing unit 123 adjusts the waveform so that the amplitudes and the phases at both ends of the beat signal match, calculates an orthogonal component through Hilbert transform of the adjusted beat signal, calculates an instantaneous phase of the beat signal by calculating the arctangent of the orthogonal component and the adjusted beat signal, and calculates the frequency sweep characteristic of the laser light from the instantaneous phase and the optical path length difference.
Inventors:
MORIGUCHI CHIHIRO (JP)
YOSHIMOTO NAOKI (JP)
SHIMOGAKI TETSUYA (JP)
YAMASHITA TATSUYA (JP)
NAKAI MAKOTO (JP)
YOSHIMOTO NAOKI (JP)
SHIMOGAKI TETSUYA (JP)
YAMASHITA TATSUYA (JP)
NAKAI MAKOTO (JP)
Application Number:
PCT/JP2023/018182
Publication Date:
November 30, 2023
Filing Date:
May 15, 2023
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
G01S17/34; G01C3/06; G01S7/491
Foreign References:
| JP2014202716A | 2014-10-27 | |||
| CN110487313A | 2019-11-22 | |||
| JP2009068841A | 2009-04-02 |
Other References:
ZHANG XIAOSHENG, POULS JAZZ, WU MING C.: "Laser frequency sweep linearization by iterative learning pre-distortion for FMCW LiDAR", OPTICS EXPRESS, vol. 27, no. 7, 1 April 2019 (2019-04-01), pages 9965 - 9974 , XP055972606, DOI: 10.1364/OE.27.009965
TANG LIWEI; JIA HONGXIANG; YANG SIGANG; CHEN HONGWEI; CHEN MINGHUA: "Iterative learning pre-distortion linearization for hybrid integrated frequency-modulated continuous-wave laser source", PROCEEDINGS OF THE SPIE, SPIE, US, vol. 11891, 9 October 2021 (2021-10-09), US, pages 118910B-1 - 118910B-5, XP060148095, ISSN: 0277-786X, ISBN: 978-1-5106-5738-0, DOI: 10.1117/12.2600550
TANG LIWEI; JIA HONGXIANG; YANG SIGANG; CHEN HONGWEI; CHEN MINGHUA: "Iterative learning pre-distortion linearization for hybrid integrated frequency-modulated continuous-wave laser source", PROCEEDINGS OF THE SPIE, SPIE, US, vol. 11891, 9 October 2021 (2021-10-09), US, pages 118910B-1 - 118910B-5, XP060148095, ISSN: 0277-786X, ISBN: 978-1-5106-5738-0, DOI: 10.1117/12.2600550
Attorney, Agent or Firm:
TOHDA, Kiyoshi (JP)
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